add method writeTo()

src/de/inetsoftware/jwebassembly/binary/WasmOutputStream.java

@@ -130,4 +130,16 @@ class WasmOutputStream extends FilterOutputStream {
         baos.writeTo( this );
     }
 
+    /**
+     * Write the data of this stream to the output. Work only for in memory stream.
+     * 
+     * @param output
+     *            the target
+     * @throws IOException
+     *             if any I/O error occur
+     */
+    void writeTo( OutputStream output ) throws IOException {
+        ByteArrayOutputStream baos = (ByteArrayOutputStream)out;
+        baos.writeTo( output );
+    }
 }